Máirín Johnston is an Irish author and historian who has written on women in Ireland: one of her books is Dublin Belles – the memories and vision of 24 women who live, love and work in Dublin. She’s written just the one (as far as I know) children’s book: The Pony Express.

Finding the book
Still in print.

Bibliography: pony books only
Pony Express, Attic Publishing, Dublin, 1993, 144 pp